Function advent_of_code_2021::day_2::navigate_and_aim

fn navigate_and_aim(
    instructions: &Vec<(Direction, isize)>
) -> (isize, isize, isize)

This starts with the submarine at the origin, with a third variable ‘aim’ also set to 0. The position and aim are updated using the following rules:

• Forward: Increase the horizontal position by the magnitude, increase the depth by (magnitude x current aim)
• Up: Decrease the aim by the magnitude
• Down: Increase the aim by the magnitude

The final position and aim after applying all the instructions in order is returned as a tuple (horizontal_position, depth, aim)

Example from puzzle specification

let input = vec![
    (FORWARD, 5),
    (DOWN, 5),
    (FORWARD, 8),
    (UP, 3),
    (DOWN, 8),
    (FORWARD, 2),
]
assert_eq!(navigate_and_aim(&input), (15, 60, 10))